MUSEUM MINIATURES WAR WAGONS
15/WG25WAR WAGON (RENAISSANCE) OX DRAWN AND 15/WG18 WAR WAGON PESHNEG (SPOKED WHEEL) SEEM TO BE THE SAME WAGON. They do not have a Hussite/Hungarian war wagon. They do have a large number of differnet wagon styles, howerver. Check out their web catalog. I plan on using the Oxen version for my Moghul army.
http://www.btinternet.com/~museumminiatures/mm.html
(CLICK ON PICTURE FOR LARGER VERSION)